6" x 34" or 34" x 6" Cube Core Eggcrate Return Air Grille sidewall + Product Details Size -

+ Product Details Size - 34"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 16"w X 12"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 38 5/8" width X 34 5/8" height

High Standard Quality - Every part is hand inspected for quality before it is packaged

actual front end outer dimensions are approximately 28 5/8" width X 36 5/8" height

6" x 34" or 34" x 6" Cube Core Eggcrate Return Air Grille sidewall + Product Details Size -+ Product Details Size 6" x 34" or 34" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 35. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing